Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b677d5552dbbbab…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 07:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 051dca78bc53465ec74e83c1686ef128 SHA-1: 5bfd0ad5948b637450d9c9f375e639080332b8f3 SHA-256: 3b677d5552dbbbabd564288dfc6ef8bae9783ebaa4204d672ca09ab4f221199f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The document contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/47871020736.pdf In PDF document text
    • http://erictex.com/ufiles/files/15718090401.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f341a0e9b6---20784258388.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d6665a57---23911528844.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3e9a54d498893036e2c25e7e51c8001d/vuriradofegegekanedapeg.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d0de720d2e747fc55a3881c1d2fd5fd6/jemosemowizurukoxejare.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae0d14ffb7---lazegux.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505142400_647669123.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62f481174---65989295554.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9854ffbd9edab30fc10c46503fa635d0/ladefabewazawedef.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/10264871351.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/26148395465.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/25058264545.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/zorutebojugizobavokofi.pdfIn PDF document text
    • http://henca.com/files/details/file/moxukete.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/dujubabekemuvisoxoma.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210830/file/90099426566.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/85srk7m1qn1jq2b8fr4cft7g47/jomisuwarenufex.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/vemasopopalafetojupol.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bemosa.pdfIn PDF document text
    • http://huntland.hu/upload/file/jugisomo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac883971f9c---mifobolidogunikoruna.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b558b469---lugoxaretotenaromigulefa.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/tujefus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=severe+acute+respiratory+syndrome+%28sars%29+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 11244 bytes
SHA-256: 12bacc2ca6d4329185f3af57be0b88c000328733d71014e6d76c92b0b3fdde6e
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 18092 bytes
SHA-256: a9f8eb4ac00535f25cb228b2e3286f2605cf07a7441fffbb05e47ec57292fbdc

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